|Publication number||US7758206 B2|
|Application number||US 11/213,183|
|Publication date||Jul 20, 2010|
|Priority date||Aug 27, 2004|
|Also published as||CN1740868A, CN100495156C, US20060044780|
|Publication number||11213183, 213183, US 7758206 B2, US 7758206B2, US-B2-7758206, US7758206 B2, US7758206B2|
|Original Assignee||Samsung Electronics Co., Ltd.|
|Export Citation||BiBTeX, EndNote, RefMan|
|Patent Citations (32), Referenced by (4), Classifications (12), Legal Events (3)|
|External Links: USPTO, USPTO Assignment, Espacenet|
This application claims priority under 35 USC §119 to Korean Patent Application No. 2004-67751 filed on Aug. 27, 2004, the content of which is herein incorporated by reference in its entirety for all purposes.
1. Field of the Invention
The present invention relates to a backlight assembly and a liquid crystal display (LCD) apparatus having the backlight assembly. More particularly, the present invention relates to a backlight assembly that is capable of reducing the leakage current of a lamp, and an LCD apparatus having the backlight assembly.
2. Description of the Related Art
Recently, there has been much technical progress made with information-processing devices. As a part of this progress, much progress has also been made to display apparatuses that interface the data that is processed by the information-processing devices to convert the data to a user-recognized format.
An LCD apparatus, which is known for advantages such as light weight, small size, full-color, high resolution, etc., has been widely used in display apparatuses. The LCD apparatus converts variations of optical characteristics of a liquid crystal (LC) cell into visual variations. Since the LCD apparatus does not generate light on its own, a backlight assembly is employed in the LCD apparatus to act as the light source. The LCD apparatus displays an image by using the light from the backlight assembly.
The backlight assembly is classified as either a direct illumination type or an edge illumination type in accordance with positions of the light source. The direct illumination type backlight assembly includes a light source positioned under an LCD panel. Light emitted from the light source is directly irradiated onto an entire surface of the LCD panel. Since the direct illumination type backlight assembly utilizes more light sources than those of the edge illumination type backlight assembly, the direct illumination type backlight assembly generally has a higher luminance than the edge illumination type backlight assembly.
The direct illumination type LCD apparatus includes an LCD panel displaying an image and a backlight assembly providing the LCD panel with light.
As shown in
To prevent or reduce the leakage current of the lamp 10, the distance L1 between the lamp 10 and the bottom chassis 50 is increased. However, the lengthening of the distance L1 causes an increase of a thickness of the LCD apparatus. Thus, a method that allows a reduction in the lamp current leakage without undesirably increasing the thickness of the LCD apparatus is desired.
The present invention provides a backlight assembly that is capable of reducing a leakage current of a lamp. The present invention also provides an LCD apparatus having the above-mentioned backlight assembly.
A backlight assembly in accordance with one aspect of the present invention includes a lamp and a metal container. The lamp generates light. The metal container receives the lamp. The metal container includes a bottom plate having a first region and a second region. The lamp is disposed over the first region. A distance between a virtual plane, which is parallel to the bottom plate and passes through a center of the lamp, and the first region of the bottom plate is larger than a distance between the virtual plane and the second region of the bottom plate.
A backlight assembly in accordance with another aspect of the present invention includes a plurality of lamps emitting a first light. An optical member converts the first light into a second light having enhanced optical characteristics. A receiving member receives the lamps and the optical member. The receiving member has protrusions that are aligned with the lamps. The protrusions protrude away from the lamps.
A backlight assembly in accordance with still another aspect of the present invention includes a plurality of lamps emitting a first light. An optical member converts the first light into a second light having enhanced optical characteristics. A reflection plate is positioned under the lamps. The reflection plate reflects the first light toward the optical member. A bottom chassis is placed under the reflection plate to receive the reflection plate and the lamps. The bottom chassis includes a bottom face and sidewalls extending from edges of the bottom face. Also, the bottom chassis has recesses that are formed at surface portions of the bottom chassis that are aligned with each of the lamps.
A liquid crystal display apparatus in accordance with still another aspect of the present invention includes a plurality of lamps emitting a first light. An optical member converts the first light into a second light having enhanced optical characteristics. A receiving member receives the lamps and the optical member. The receiving member has protrusions corresponding to the lamps. The protrusions protrude away from the lamps. A liquid crystal display panel assembly displays an image using the second light. A top chassis is combined with the receiving member to fix the liquid crystal display panel assembly to the receiving member.
A liquid crystal display apparatus in accordance with yet still another aspect of the present invention includes a plurality of lamps emitting a first light. An optical member converts the first light into a second light having enhanced optical characteristics. A reflection plate is positioned under the lamps to reflect the first light to the optical member. A bottom chassis is placed under the reflection plate to receive the reflection plate and the lamps. The bottom chassis includes a bottom face and sidewalls extending from edges of the bottom face. Also, the bottom chassis has recesses that are formed at surface portions of the bottom chassis that are aligned with each of the lamps. A liquid crystal display panel assembly displays an image using the second light. A top chassis is combined with the bottom chassis to fix the liquid crystal display panel assembly to the bottom chassis.
According to the present invention, the distance between the lamps and the receiving member is increased without also increasing the thickness of the LCD apparatus. As a result, the capacitance of the capacitor that forms between the lamps and the receiving member is maintained at a low level and the leakage current of the backlight assembly may be decreased.
The above and other features and advantages of the present invention will become more apparent by describing in detailed exemplary embodiments thereof with reference to the accompanying drawings, in which:
The present invention is described more fully hereinafter with reference to the accompanying drawings, in which embodiments of the invention are shown. This invention may, however, be embodied in many different forms and should not be construed as limited to the embodiments set forth herein. Rather, these embodiments are provided so that this disclosure will be thorough and complete, and will fully convey the scope of the invention to those skilled in the art. In the drawings, the size and relative sizes of layers and regions may be exaggerated for clarity.
It will be understood that when an element or layer is referred to as being “on”, “connected to” or “coupled to” another element or layer, it can be directly on, connected or coupled to the other element or layer or intervening elements or layers may be present. In contrast, when an element is referred to as being “directly on,” “directly connected to” or “directly coupled to” another element or layer, there are no intervening elements or layers present. Like numbers refer to like elements throughout. As used herein, the term “and/or” includes any and all combinations of one or more of the associated listed items.
It will be understood that, although the terms first, second, etc. may be used herein to describe various elements, components, regions, layers and/or sections, these elements, components, regions, layers and/or sections should not be limited by these terms. These terms are only used to distinguish one element, component, region, layer or section from another region, layer or section. Thus, a first element, component, region, layer or section discussed below could be termed a second element, component, region, layer or section without departing from the teachings of the present invention.
Spatially relative terms, such as “beneath”, “below”, “lower”, “above”, “upper” and the like, may be used herein for ease of description to describe one element or feature's relationship to another element(s) or feature(s) as illustrated in the figures. It will be understood that the spatially relative terms are intended to encompass different orientations of the device in use or operation in addition to the orientation depicted in the figures. For example, if the device in the figures is turned over, elements described as “below” or “beneath” other elements or features would then be oriented “above” the other elements or features. Thus, the exemplary term “below” can encompass both an orientation of above and below. The device may be otherwise oriented (rotated 90 degrees or at other orientations) and the spatially relative descriptors used herein interpreted accordingly.
The terminology used herein is for the purpose of describing particular embodiments only and is not intended to be limiting of the invention. As used herein, the singular forms “a”, “an” and “the” are intended to include the plural forms as well, unless the context clearly indicates otherwise. It will be further understood that the terms “includes” and/or “including”, when used in this specification, specify the presence of stated features, integers, steps, operations, elements, and/or components, but do not preclude the presence or addition of one or more other features, integers, steps, operations, elements, components, and/or groups thereof.
Unless otherwise defined, all terms (including technical and scientific terms) used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this invention belongs. It will be further understood that terms, such as those defined in commonly used dictionaries, should be interpreted as having a meaning that is consistent with their meaning in the context of the relevant art and will not be interpreted in an idealized or overly formal sense unless expressly so defined herein.
In the backlight assembly shown in
Alternatively, as shown in
Alternatively, as shown in
In the embodiment of
Alternatively, as shown in
In the embodiment of
Alternatively, as shown in
The LCD panel assembly 200 includes an LCD panel 210, a first printed circuit board (PCB) 220, a second PCB 230, a first tape carrier package (TCP) 240 electrically connected to the first PCB 220, and a second TCP 250 electrically connected to the second PCB 230. The backlight assembly 300 further includes a middle chassis 550 and a top chassis 500.
The LCD panel 210 includes a thin film transistor (TFT) substrate 211, a color filter substrate 213 facing the TFT substrate 211, and an LC layer (not shown) interposed between the TFT substrate 211 and the color filter substrate 213.
The TFT substrate 211 includes a glass substrate on which TFTs are arranged in a matrix pattern. The TFT substrate 211 includes source terminals electrically connected to data lines and gate terminals electrically connected to gate lines. Pixel electrodes including transparent ITO are formed on drain terminals.
The color filter substrate 213 is positioned over the TFT substrate 211. The color filter substrate 213 has at least one color pixel member including a red pixel portion, a green pixel portion and a blue pixel portion. When the light rays pass through the color pixel member, the color of the light may change. The color pixel member may be formed in the color filter substrate 213 by a thin film process. A front face of the color filter substrate 213 is covered with a common electrode including a transparent conductive material such as ITO.
The first and second PCBs 220 and 230 are connected to the first and second TCP 240 and 250, respectively. The first and second PCBs 220 and 230 receive external image signals and then provide the gate line and the data line with drive signals. In order to operate the LCD device 1000, the first and second PCBs 220 and 230 generate gate and data drive signals, respectively. In addition, the first and second PCBs 220 and 230 generate a plurality of timing signals enabling the gate drive signal and the data drive signal to be applied to the gate line and the data line at a desired timing. The gate drive signal and the data drive signal may be applied to the gate line and the data line through the first TCPs 240 and 250, respectively.
Here, the backlight assembly 300 includes the bottom chassis 350 having the protrusion 355 in
The LCD apparatus of
The LCD apparatus 1200 in
According to the present invention, a receiving member has the protrusion or the recess aligned with the lamps so that the distance between the receiving member and the lamps may be lengthened. As a result, a capacitor may not be formed between the receiving member and the lamps and a leakage current of the lamps may be reduced.
Having described the exemplary embodiments of the present invention and its advantages, it is noted that various changes, substitutions and alterations can be made herein without departing from the spirit and scope of the invention as defined by appended claims.
|Cited Patent||Filing date||Publication date||Applicant||Title|
|US3009053 *||Mar 12, 1959||Nov 14, 1961||George G Roberts||Lamp assembly|
|US4425604 *||Nov 26, 1982||Jan 10, 1984||Nissan Motor Company, Limited||Illuminating device for a display unit|
|US5128781 *||Sep 20, 1990||Jul 7, 1992||Nippon Steel Corporation||Transmissive liquid display apparatus having a thin construction without diminished brightness|
|US5253151 *||Sep 30, 1991||Oct 12, 1993||Rockwell International Corporation||Luminaire for use in backlighting a liquid crystal display matrix|
|US5479275 *||Dec 3, 1993||Dec 26, 1995||Ois Optical Imaging Systems, Inc.||Backlit liquid crystal display with integral collimating, refracting, and reflecting means which refracts and collimates light from a first light source and reflects light from a second light source|
|US5479328 *||Jan 5, 1994||Dec 26, 1995||Interstate Electronics Corporation||High-brightness, high-efficacy backlight|
|US5871273 *||Sep 29, 1994||Feb 16, 1999||Rockwell International||Optical light piping reflector element for backlighting liquid crystal displays|
|US5975722 *||Aug 20, 1997||Nov 2, 1999||Flat Panel Display Co. B.V.||Backlight luminaire|
|US5986728 *||Jul 23, 1997||Nov 16, 1999||Litton Systems, Inc.||Optically enhance day/night liquid crystal display backlight with TIR lens and both light sources on same side of waveguide|
|US5993027 *||Sep 30, 1997||Nov 30, 1999||Sony Corporation||Surface light source with air cooled housing|
|US6089739 *||Dec 4, 1998||Jul 18, 2000||Sony Corporation||Surface light source device|
|US6095656 *||Aug 19, 1998||Aug 1, 2000||Kabushiki Kaisha Toshiba||Backlighting apparatus and display apparatus using the same|
|US6331064 *||Nov 26, 1999||Dec 18, 2001||Hitachi, Ltd.||Liquid crystal display|
|US6336728 *||Aug 22, 2000||Jan 8, 2002||Rockwell Collins, Inc||Flat panel display light guide|
|US6407781 *||Mar 23, 2001||Jun 18, 2002||Hitachi, Ltd.||LCD device having electronic formed within concave portion of a reflector|
|US6428183 *||Oct 30, 2000||Aug 6, 2002||X-Tra Light Manufacturing, Inc.||Fluorescent light fixture|
|US6445373 *||Sep 9, 1999||Sep 3, 2002||Sony Corporation||Display apparatus|
|US6491411 *||Jun 22, 2001||Dec 10, 2002||Advanced Display Inc.||Sheet-like light source device|
|US6692137 *||May 11, 2001||Feb 17, 2004||L-3 Communications||Display system using a hybrid backlight reflector|
|US6793361 *||Jun 14, 2002||Sep 21, 2004||Hirokazu Matsui||Backlight illuminator|
|US7104671 *||May 28, 2004||Sep 12, 2006||K-Bridge Electronics Co., Ltd.||Lamp replacement|
|US7121694 *||Aug 1, 2003||Oct 17, 2006||Au Optronics Corp.||Back light unit with high heat transfer rate|
|US20030058635 *||Jun 14, 2002||Mar 27, 2003||Hirokazu Matsui||Backlight illuminator|
|US20030223249 *||Jun 2, 2003||Dec 4, 2003||Tae-Jin Lee||Liquid crystal display device having a noise shielding member|
|US20030234896 *||Apr 1, 2003||Dec 25, 2003||Yong-Il Kim||Backlight assembly and direct lighting type liquid crystal display apparatus|
|US20040008524 *||May 30, 2003||Jan 15, 2004||Keun-Woo Lee||Backlight assembly and liquid crystal display device using the same|
|US20040032725 *||Apr 22, 2003||Feb 19, 2004||Chin-Kun Hsieh||Direct-type backlight unit for flat panel liquid crystal displays|
|US20040062034 *||Jul 2, 2003||Apr 1, 2004||Au Optronics Corp.||Direct backlight module|
|US20040076006 *||May 6, 2003||Apr 22, 2004||Che-Kuei Mai||Back light module|
|US20040114396 *||Oct 29, 2003||Jun 17, 2004||Fujitsu Display Technologies Corporation||Illumination device and liquid crystal display device using the same|
|US20050002173 *||Apr 9, 2004||Jan 6, 2005||Yu-Jen Chuang||Direct backlight module|
|JPH04275525A *||Title not available|
|Citing Patent||Filing date||Publication date||Applicant||Title|
|US8944622 *||Jan 20, 2012||Feb 3, 2015||Lg Innotek Co., Ltd.||Lighting system having reflector support and display device|
|US20100020533 *||Sep 5, 2007||Jan 28, 2010||Sharp Kabushiki Kaisha||Light source unit and display device|
|US20100079976 *||Sep 5, 2007||Apr 1, 2010||Sharp Kabushiki Kaisha||Light source unit and display device|
|US20130044460 *||Jan 20, 2012||Feb 21, 2013||Young Bae Jang||Backlight unit and lighting system including the same|
|U.S. Classification||362/217.05, 362/225, 362/249.01, 362/217.1|
|International Classification||F21V7/10, F21V7/04|
|Cooperative Classification||G02F1/133604, G02F1/133608, G02F1/133605|
|European Classification||G02F1/1336B5, G02F1/1336B2, G02F1/1336B3|
|Oct 10, 2005||AS||Assignment|
Owner name: SAMSUNG ELECTRONICS CO., LTD., KOREA, REPUBLIC OF
Free format text: ASSIGNMENT OF ASSIGNORS INTEREST;ASSIGNOR:KIM, YONG-IL;REEL/FRAME:016633/0027
Effective date: 20050822
|Sep 21, 2012||AS||Assignment|
Owner name: SAMSUNG DISPLAY CO., LTD., KOREA, REPUBLIC OF
Free format text: ASSIGNMENT OF ASSIGNORS INTEREST;ASSIGNOR:SAMSUNG ELECTRONICS CO., LTD.;REEL/FRAME:028999/0611
Effective date: 20120904
|Jan 9, 2014||FPAY||Fee payment|
Year of fee payment: 4